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                <time datetime="2019-05-09T21:01:53.000Z" itemprop="datePublished" class="page-time">
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            <h4>TOC</h4>
            <ol class="post-toc"><li class="post-toc-item post-toc-level-2"><a class="post-toc-link" href="#学习笔记-初识-Spring"><span class="post-toc-number">1.</span> <span class="post-toc-text">学习笔记 : 初识 Spring</span></a><ol class="post-toc-child"><li class="post-toc-item post-toc-level-3"><a class="post-toc-link" href="#Spring-简介"><span class="post-toc-number">1.1.</span> <span class="post-toc-text">Spring 简介</span></a></li><li class="post-toc-item post-toc-level-3"><a class="post-toc-link" href="#Spring-框架优点"><span class="post-toc-number">1.2.</span> <span class="post-toc-text">Spring 框架优点</span></a></li><li class="post-toc-item post-toc-level-3"><a class="post-toc-link" href="#Spring-核心容器"><span class="post-toc-number">1.3.</span> <span class="post-toc-text">Spring 核心容器</span></a><ol class="post-toc-child"><li class="post-toc-item post-toc-level-4"><a class="post-toc-link" href="#BeanFactory"><span class="post-toc-number">1.3.1.</span> <span class="post-toc-text">BeanFactory</span></a></li><li class="post-toc-item post-toc-level-4"><a class="post-toc-link" href="#ApplicationContext"><span class="post-toc-number">1.3.2.</span> <span class="post-toc-text">ApplicationContext</span></a></li></ol></li><li class="post-toc-item post-toc-level-3"><a class="post-toc-link" href="#依赖注入"><span class="post-toc-number">1.4.</span> <span class="post-toc-text">依赖注入</span></a><ol class="post-toc-child"><li class="post-toc-item post-toc-level-4"><a class="post-toc-link" href="#属性setter方法注入"><span class="post-toc-number">1.4.1.</span> <span class="post-toc-text">属性setter方法注入</span></a></li><li class="post-toc-item post-toc-level-4"><a class="post-toc-link" href="#构造方法注入"><span class="post-toc-number">1.4.2.</span> <span class="post-toc-text">构造方法注入</span></a></li></ol></li><li class="post-toc-item post-toc-level-3"><a class="post-toc-link" href="#Spring-简单示例程序"><span class="post-toc-number">1.5.</span> <span class="post-toc-text">Spring 简单示例程序</span></a></li></ol></li></ol>
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        <h1 class="post-card-title">Hi Spring ~</h1>
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            <time class="post-time" title="2019-05-09 21:01:53" datetime="2019-05-09T21:01:53.000Z"  itemprop="datePublished">2019-05-09</time>

            


            

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            <h2 id="学习笔记-初识-Spring"><a href="#学习笔记-初识-Spring" class="headerlink" title="学习笔记 : 初识 Spring"></a>学习笔记 : 初识 Spring</h2><h3 id="Spring-简介"><a href="#Spring-简介" class="headerlink" title="Spring 简介"></a>Spring 简介</h3><p><em><code>Spring</code>是由Rod Johnson组织和开发的一个分层的Java SE/EE full-stack(一站式)轻量级开源框架,它以<code>IoC</code>(Inversoin of Control,控制反转)和<code>AOP</code>(Aspect Oriented Programming,面向切面编程)为内核,使用基本的JavaBean来完成以前只可能由<code>EJB</code>(Enterprise Java Beans,Java企业Bean)完成的工作.取代了EJB的臃肿,低效的开发模式哟 !</em></p>
<h3 id="Spring-框架优点"><a href="#Spring-框架优点" class="headerlink" title="Spring 框架优点"></a>Spring 框架优点</h3><p><em>Spring 具有简单,可测试和松耦合等特点,从这个角度出发,Spring可适用于服务器端/任何Java应用的开发.</em></p>
<ol>
<li>非侵入式设计</li>
<li>方便耦合,简化开发</li>
<li>支持AOP</li>
<li>支持声明式事务处理</li>
<li>方便程序的测试</li>
<li>方便集成各种优秀的框架</li>
<li>降低Java EE API的使用难度</li>
</ol>
<h3 id="Spring-核心容器"><a href="#Spring-核心容器" class="headerlink" title="Spring 核心容器"></a>Spring 核心容器</h3><p><em>Spring框架的主要功能是通过其核心容器来实现.Spring框架提供了两种核心容器,分别是<code>BeanFatory</code>和<code>ApplicatoinContext</code>.</em></p>
<h4 id="BeanFactory"><a href="#BeanFactory" class="headerlink" title="BeanFactory"></a>BeanFactory</h4><p><em><code>BeanFactory</code>为基础类型的Ioc容器,简单的说就是一个管理Bean的工厂,它主要负责初始化各种Bean,并调用它们的生命周期方法.</em></p>
<h4 id="ApplicationContext"><a href="#ApplicationContext" class="headerlink" title="ApplicationContext"></a>ApplicationContext</h4><p><em><code>ApplicationContext</code>是<code>BeanFactory</code>的子接口,也称为应用上下文,不仅包含了BeanFactory的所有功能,还添加了对国际化,资源访问,事件传播等方面的支持.有两种创建ApplicatoinContext接口实例的方法.</em></p>
<ol>
<li><p>通过<code>ClassPathXmlApplicationContext</code>创建<br><em>通过类路径classPath中寻找指定的XML配置文件,找到并装载完成ApplicationContext的实例化工作.</em></p>
</li>
<li><p>通过<code>FileSystemXmlApplicatoinContext</code>创建<br><em>通过指定的文件系统路径(绝对路径)中寻找指定的XML配置文件,找到并装载完成ApplicationContext的实例化工作.</em></p>
</li>
</ol>
<h3 id="依赖注入"><a href="#依赖注入" class="headerlink" title="依赖注入"></a>依赖注入</h3><p><em>依赖注入的作用就是在使用Spring框架创建对象时,动态地将其所依赖的对象注入<code>Bean</code>组件中,其实现方式通常有两种,一种是属性<code>setter方法</code>注入,另一种是<code>构造方法</code>注入.</em></p>
<h4 id="属性setter方法注入"><a href="#属性setter方法注入" class="headerlink" title="属性setter方法注入"></a>属性setter方法注入</h4><p><em>指Spring容器使用setter方法注入被依赖的实例.通过调用无参的构造器或无参静态工厂方法实例化Bean后,调用该Bean的setter方法,即可实现基于setter方法的依赖注入.</em></p>
<h4 id="构造方法注入"><a href="#构造方法注入" class="headerlink" title="构造方法注入"></a>构造方法注入</h4><p><em>指Spring容器使用的构造方法注入被依赖的实例.基于构造方法的依赖注入通过带参数的构造方法来实现,每个参数代表着一个依赖.</em></p>
<h3 id="Spring-简单示例程序"><a href="#Spring-简单示例程序" class="headerlink" title="Spring 简单示例程序"></a>Spring 简单示例程序</h3><ol>
<li><p><em>创建一个简单的Java bean</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> pers.huangyuhui.spring.bean;</span><br><span class="line"></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">HiSpring5</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">	<span class="keyword">private</span> String name;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="title">HiSpring5</span><span class="params">()</span> </span>&#123;</span><br><span class="line">		System.out.println(<span class="string">"The Constructor  be called !"</span>);</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setName</span><span class="params">(String name)</span> </span>&#123;</span><br><span class="line">		System.out.println(<span class="string">"setName(String name) method be called !"</span>);</span><br><span class="line">		<span class="keyword">this</span>.name = name;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">ouputName</span><span class="params">()</span> </span>&#123;</span><br><span class="line">		System.out.println(<span class="string">"ouputName() method: my name is "</span> + name + <span class="string">" !"</span>);</span><br><span class="line">	&#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>创建Spring的配置文件: applicationContext.xml</em></p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">&lt;?xml version="1.0" encoding="UTF-8"?&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">beans</span> <span class="attr">xmlns</span>=<span class="string">"http://www.springframework.org/schema/beans"</span></span></span><br><span class="line"><span class="tag">	<span class="attr">xmlns:xsi</span>=<span class="string">"http://www.w3.org/2001/XMLSchema-instance"</span></span></span><br><span class="line"><span class="tag">	<span class="attr">xsi:schemaLocation</span>=<span class="string">"http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"</span>&gt;</span></span><br><span class="line">	</span><br><span class="line">	<span class="comment">&lt;!--</span></span><br><span class="line"><span class="comment">	id: IOC容器中Bean的唯一标识</span></span><br><span class="line"><span class="comment">	class: 通过反射机制在IOC容器中创建Bean(所以要求Bean中必须有无参的构造器).</span></span><br><span class="line"><span class="comment">	--&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">bean</span> <span class="attr">id</span>=<span class="string">"SpringTestID"</span> <span class="attr">class</span>=<span class="string">"pers.huangyuhui.spring.bean.HiSpring5"</span>&gt;</span></span><br><span class="line">		<span class="comment">&lt;!-- 初始化HiSpring类中的属性名为name的值 --&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">property</span> <span class="attr">name</span>=<span class="string">"name"</span> <span class="attr">value</span>=<span class="string">"Spring"</span>&gt;</span><span class="tag">&lt;/<span class="name">property</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;/<span class="name">bean</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;/<span class="name">beans</span>&gt;</span></span><br></pre></td></tr></table></figure>
</li>
<li><p><em>测试类</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> pers.huangyuhui.spring.bean.test;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> org.junit.Test;</span><br><span class="line"><span class="keyword">import</span> org.springframework.context.ApplicationContext;</span><br><span class="line"><span class="keyword">import</span> org.springframework.context.support.ClassPathXmlApplicationContext;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> pers.huangyuhui.spring.bean.HiSpring5;</span><br><span class="line"></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Spring5Test</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">	<span class="meta">@Test</span></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">test</span><span class="params">()</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">		</span><br><span class="line">        <span class="comment">// 创建Spring的IOC对象</span></span><br><span class="line">		ApplicationContext applicationContext = <span class="keyword">new</span> ClassPathXmlApplicationContext(<span class="string">"applicationContext.xml"</span>);</span><br><span class="line"></span><br><span class="line">		<span class="comment">// 从IOC容器中获取Bean实例</span></span><br><span class="line">		HiSpring5 hiSpring5 = (HiSpring5) applicationContext.getBean(<span class="string">"SpringTestID"</span>);</span><br><span class="line">        </span><br><span class="line">		hiSpring5.ouputName();</span><br><span class="line"></span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>程序运行结果如下</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">May <span class="number">14</span>, <span class="number">2019</span> <span class="number">4</span>:<span class="number">23</span>:<span class="number">28</span> PM org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh</span><br><span class="line">INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext<span class="meta">@a</span>2431d0: startup date [Tue May <span class="number">14</span> <span class="number">16</span>:<span class="number">23</span>:<span class="number">28</span> CST <span class="number">2019</span>]; root of context hierarchy</span><br><span class="line">May <span class="number">14</span>, <span class="number">2019</span> <span class="number">4</span>:<span class="number">23</span>:<span class="number">28</span> PM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions</span><br><span class="line">INFO: Loading XML bean definitions from class path resource [applicationContext.xml]</span><br><span class="line"></span><br><span class="line">The Constructor  be called !</span><br><span class="line">setName(String name) method be called !</span><br><span class="line">ouputName() method: my name is Spring !</span><br></pre></td></tr></table></figure></li>
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